我将计时器初始化为11000毫秒，并显示日志，看到计时器从10959毫秒变为1484毫秒
private void startGameCountDown() {
mCountDownTimer = new CountDownTimer(11000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
Log.i(TAG, "onTick: " + millisUntilFinished);
mTimerTv.setText(String.format("%d", millisUntilFinished));
mTimerTv.invalidate();
}
@Override
public void onFinish() {
}
}.start();
怎么了
我最终创建了自己的计时器：
public abstract class CountDownTimer {
private static final String TAG = CountDownTimer.class.getSimpleName();
private static final long TIMER_DEFAULT = 4000; //ms
private static final long TIMER_STEP = 1000; //ms
private boolean mIsRunning = false;
private long mRemainingTime = 0;
private long mTotalTime;
private Handler mHandler = new Handler();
/**
* Callback fired on regular interval.
*
* @param millisUntilFinished The amount of time until finished.
*/
public abstract void onTick(long millisUntilFinished);
/**
* Callback fired when the time is up.
*/
public abstract void onFinish();
public CountDownTimer(long timerStartValue) {
if (timerStartValue >= 1) {
mTotalTime = timerStartValue * TIMER_STEP;
mRemainingTime = timerStartValue * TIMER_STEP;
} else {
mTotalTime = TIMER_DEFAULT;
mRemainingTime = TIMER_DEFAULT;
}
}
public CountDownTimer start() {
mIsRunning = true;
// Start the initial runnable task by posting through the handler
mHandler.postDelayed(runnableCode, TIMER_STEP);
return this;
}
public void cancel() {
mIsRunning = false;
mHandler.removeCallbacks(runnableCode);
}
private Runnable runnableCode = new Runnable() {
@Override
public void run() {
if (mRemainingTime >= 0) {
onTick(mRemainingTime);
} else {
mIsRunning = false;
onFinish();
}
mRemainingTime -= TIMER_STEP;
if (mIsRunning) {
// Goes on
mHandler.postDelayed(runnableCode, TIMER_STEP);
}
}
};
}
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